Extended linear regime of cavity-QED enhanced optical circular birefringence induced by a charged quantum dot

Abstract

Giant optical Faraday rotation (GFR) and giant optical circular birefringence (GCB) induced by a single quantum-dot spin in an optical microcavity can be regarded as linear effects in the weak-excitation approximation if the input field lies in the low-power limit [Hu et al, Phys.Rev. B {\bf 78}, 085307(2008) and ibid {\bf 80}, 205326(2009)]. In this work, we investigate the transition from the weak-excitation approximation moving into the saturation regime comparing a semiclassical approximation with the numerical results from a quantum optics toolbox [S.M. Tan, J. Opt. B {\bf 1}, 424 (1999)]. We find that the GFR and GCB around the cavity resonance in the strong coupling regime are input-field independent at intermediate powers and can be well described by the semiclassical approximation. Those associated with the dressed state resonances in the strong coupling regime or merging with the cavity resonance in the Purcell regime are sensitive to input field at intermediate powers, and cannot be well described by the semiclassical approximation due to the quantum dot saturation. As the GFR and GCB around the cavity resonance are relatively immune to the saturation effects, the rapid read out of single electron spins can be carried out with coherent state and other statistically fluctuating light fields. This also shows that high speed quantum entangling gates, robust against input power variations, can be built exploiting these linear effects.

Section IV has been added to show the linear GFR/GCB is not affected by high-order dressed state resonances in reflection/transmission spectra. 11 pages, 9 figures

References in corpus (14)

• The Quantum Internet
• Quantum Computing
• Nanophotonic quantum phase switch with a single atom
• A Quantum Gate between a Flying Optical Photon and a Single Trapped Atom
• Nuclear spin physics in quantum dots: an optical investigation
• Giant optical Faraday rotation induced by a single electron spin in a quantum dot: Applications to entangling remote spins via a single photon
• CNOT and Bell-state analysis in the weak-coupling cavity QED regime
• Input-Output Formalism For Few-Photon Transport in One-Dimensional Nanophotonic Waveguides Coupled to a Qubit
• Giant Optical Non-linearity induced by a Single Two-Level System interacting with a Cavity in the Purcell Regime
• Loss-resistant state teleportation and entanglement swapping using a quantum-dot spin in an optical microcavity
• Quantum computing by optical control of electron spins
• Quantum computers based on electron spins controlled by ultra-fast, off-resonant, single optical pulses
• Environment-assisted quantum control of a solid-state spin via coherent dark states
• Low-lying bifurcations in cavity quantum electrodynamics

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